Core for manufacture of pneumatic-tire casings.



P. E. WELTON.

CORErFOR MANUFACTURE OF PNEUMATIC TIRE CASINGS.

- APPLICATION FILED DEC 18. 1913. 1,156,570.

- Patented 00t.12, 1915.

U ITED STATES PATENT OFFICE.

PARK E. wELroN, or AKRON, 01110, AssIGNonTo KATHERINE 5B. WELTON, or

AKRON, OHIO.

CORE FOR MANUFACTURE OF PNEUMATIC-TIRE C ASINGS.

Specification of Letters Patent.

Patented Oct. 12, 1915.

Applicationlfiled December is, 1913. Serial No. 807,397.

To all whom it may concern:

Be it known that I, PARK E. WELTON, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Improvement in Cores for Mannfacture of Pneumatic-Tire Casings, of which the following is a full, clear, and exact description.

This invention relates to novelmeans by which the sections of a knock-down tire core may be quickly and accurately brought into and held in proper relation to one another, and quickly disconnected when the core is to be knocked down in order that it may .be removed. from the finished tire casing.

The invention in the form disclosed in the drawing, not only serves the above purposes,

but likewise it permits the .core to be put I together and taken apart from the same side thereofwthat is to say, without having to liftit or turn it over. I

Another advantage of theconstruction is that the inevitable wear of connecting and disconnecting the core sections does not render them useless, because 'they can be machined back into shape, and the whole device rendered operative by the substitution of a new inexpensive part, for example,- the split spring ring or the binding ring,

both of which will be hereinafter-described The invention consists in the construction and combination of parts hereinafter described and pointed out definitely in 'the appended claims. I a

In the drawing, Figure 1 is a planview of tn-assembled knock-down core in which this invention is embodied, the binding and centering ring being broken away at "one place; and Fig. 2 isa transverse sectional -view through one side of one of the core sections and the connecting devices. I

Referring to the parts by numerals 11,12, 13 and 14 represent the are shaped core sections of which the latter is the key section and has parallel ends. The cross sectional configuration of said 5 sections is such as shown in Fig. 2, that when they are accurately assembled the outer part 25 serves as a form which fits into a tire casing, while its inner part forms the flange 15. This flange is, of course, formed partly on each of the core sections. In the upper face of this flange is an annular groove 16, having,

when the core sections are in the proper relative positions, anouter wall 17, which 18 3. true cylinder. The inner wall 18 of this annular groove is preferably slightly undercut, as shown. I

19 represents a split spring ring whose inner peripheral edge 22 is inclined at an angle corresponding with that of the underout wall 18. The outer peripheral edge 26 of this split ring is also slightly tapered, as shown.

20 represents the binding and centering ring. Its outer periphery 23 is a cylinder of the same diameter as the inner periphery 17 of the core. In the bottom face of this ring is an annular-groove 21 whose inner peripheral wall 24 is tapered to correspond with the taper of the outer peripheral edge annular wall 17, and then is driven' down.

Its inclined face 21 by engaging with the inclined outer surface of the split ring will Contract said ring; and the ring in so contracting will draw the core sections inward periphery of said binding ring; and this obviously positions the core sections with absolute accuracy. The friction between this binding ring and the split ring, and

the outer wall of groove 16 will be suiiicient to hold said-binding ring in place so as to prevent any movement of the core sections while the core is in use. The undercutting of the inner wall of groove 16 and the corresponding taper of the outer periphery of the split ring makes the displacementof the split ring impossible. \Vhen it is desired to knock down the core, one inserts a screw driver or the like into the space be-- tween the lower face of the inner edge of the binding ring 20 and the top surface of toward the center of the core, whereby the cylindrical outer wall of the groove 16 in said coresections will be brought squarely and firmly against the cylindrical outerthe flange 15, and prics the binding ring I engaging surfaces of the binding ring 20 and the split ring 19. Until this wear has been considerable, the construction will remain operative because the binding ring may be driven farther down into the groove 16. When this wear has become too great to permit this, it is only necessary to substitute another split ring 19 or another binding ring.

Havlng described myinvention, I claim:

1. An annular knock-clown core comprising several arc-shaped sections, and having, whenthe sections are accurately assembled,

an inwardly extended horizontal flange in the upper surface of which is an annular groove having a cylindrical outer periphery, combined with a split spring ring which lies in said groove and has a tapered outer periphery, and a binding ring having a cylindrical outer periphery for engagement with the cylindrical outer periphery of the above mentioned annular groove and having in its lower face an annular groove whose periphery is tapered to correspond with the taper of the split ring which projects into said groove.

2. An annular knock-clown core comprising several arc-shaped sections and having, when the sections are accurately assembled, an inwardly extended horizontal flange in the upper surface of which is an annular groove whose outer periphery is cylindrical, and whose inner periphery is undercut, combined with a split spring ring which lies in Sllld groove and has a. tapered outer periphery and a tapered inner periphery for engaging the undercut periphery of the annular groove in the core flange above mentioned, and a binding ring having a cylin- Copies of this patent may be obtained for five cents each, by addressing the of the split ring which projects into it when the binding ring is inserted into the annular groove in thecore flange.

3. The combination, with a plurality of core segments each having an arcuate recess therein having spaced concentric walls one of the walls being tapered and said res cesses forming, when the segments are as-' sem-bled, a complete annular recess, one of the concentric walls whereof is tapered, of a ring cooperating with such annular recess and. comprising an outer ring and an inner ring one of said rings being split and hav ing a. surface tapered complementarily to the tapered wall of-said recess.

4. The combination, with a plurality of core segments each having an arcuate re cess therein having spaced conc'entricwalls forming, when the segments are assembled, a complete annular recess, the lnner wall whereof is tapered anda ring cooperating with such annular recess and comprising an outer continuous ring and an inner split ring, the inner split ring having its inner surface tapered complemen-tarily to the tapered wall of said recess. 1

. In a device of the character described, a ring core formed of abutting sections havimr Lnwa'rdly extending portions-,said porrie being channeled on one of their faces to term a complete annular groove, the inner wall whereof isundercut, an' inner cut ring member having its inner surface shaped complementarily to the undercut wall of said groove, and an. outer wedgerin'g member disposed in. said groove coacting with said first member for drawing.

the sections firmly together at their abutting faces.

In testimony whereof, I hereunto aflix my signature in the presence of two witnesses.

PARK E. WELTON. Witnesses L. I. Pon'rnn, A. J. HUDSON.

Commissioner of Patents,

Washington, D. 0.

7'5 fhe inner-wall being tapered, said recesses 

